"I'm trying to find a polite way to ask my current man-friend to shave his pubes off. there's no easy way is there. I just need to turn up with a good quality razor to our next encounter..."
To quote Nike... Just do it! Make it part of the foreplay! By the time you have finished he willl be gagging for it! When my first wife offered to do it I was more than a little panicky but the circumstances were a little different; we were faced with a very uncertain future at that time, the risk of a razor nick seemed to faded into insignificance! So, by all means turn up with a brand new razor; the five bladed, vibrating one from Gillette is pretty damn good. Use a sensitive skin shaving gel, and Nivea Moisturiser afterwards. As with your own pubes shave both ways, both with and against the direction of growth and ensure that the skin around the scrotum is stretched tightly. Do not under any circumstances use Veet for Men or Aftershave... unless you are feeling particularly sadistic!
Have him wax a man shaven has stubble and its a bit uncomfortable especially if your smooth down there, it creates a "rug burn"
Waxing the lower stomach and pubic bone area... maybe... but most blokes are a bit chicken about waxing... elsewhere it's a definite No-No! Back in 1996 Sara Cox and the gang from the 'Girlie Show' got a number of guys from the Cardiff Rugby Club to volunteer to have their ass cracks waxed... 'twas hilarious but I can still hear the screams! Shaving the entire area is for me a twice weekly event; if O.H. isn't about, it takes me no more than 5 minutes... its quicker in fact than shaving ones face and removes any risk of rug burn!